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为了研究硼化物(KBF4)和锶(Sr)对再生Al-Si合金中富铁相的影响,分别采用X射线荧光光谱分析仪(XRF)对试样进行成分分析,应用光学显微镜(OM)、扫描电镜(SEM)和能谱仪(EDS)对试样显微组织进行形貌观察和相成分分析。结果表明,KBF4不能起到降铁作用,但促使β-Fe相向初生α-Fe相转变,当B加入量达到0.75%时,初生α-Fe相周围出现了汉字状α-Fe相;Sr会促使β-Fe相向汉字状α-Fe相转变,当Sr加入量为0.3%时,β-Fe相几乎消失,同时,Sr对针状β-Fe相有溶解碎裂作用。
In order to study the influence of boride (KBF4) and strontium (Sr) on the iron-rich phase in regenerated Al-Si alloy, the composition of the sample was analyzed by X-ray fluorescence spectrometer (XRF) Electron microscopy (SEM) and energy dispersive spectrometer (EDS) were used to observe the morphology and phase composition of the microstructure. The results show that KBF4 can not reduce iron, but promote β-Fe phase transition to the primary α-Fe. When the amount of B added reaches 0.75%, the Chinese α-Fe phase appears around the primary α-Fe phase. The β-Fe phase transitions to the Chinese-character α-Fe phase. When the amount of Sr added is 0.3%, the β-Fe phase almost disappears. Meanwhile, the Sr phase dissolves and breaks the acicular β-Fe phase.